form {
    width: 400px;
    margin: 0 auto;
    padding: 30px;
    border: 1px solid #333;
    border-radius: 5px;
}

ul,
li {
    padding: 0;
    margin: 10px auto;
    /* 取消默认li的格式 */
    list-style: none;
}

ul li {
    height: 80px;
}

.right {
    float: right;
    width: 180px;
}

textarea {
    width: 100%;
    height: 120px;
}

.advise {
    height: 150px;
}

input[type=submit] {
    width: 100px;
    height: 30px;
    margin-top: 10px;
    cursor: pointer;
}

.footer {
    text-align: center;
}

input:focus {
    border-color: skyblue;
    overflow: hidden;
}